Precision means for grinder taper setup



March 1, 1955 w. M. HAVERSTICK 2,702,970

PRECISION MEANS FOR GRINDER TAPER SETUP Filed March 8. 1952Mumunmmunulannufih? millllnllllli I/vvE/v TOQ WALTER M. HAvEpsT/cK,

Ev Mam United StatesPatetit'O 2,702,970 7 PRECISION MEANS FOR GRINDERTAPER SETUP Walter M. Haverstick, Indianapolis, Ind.

Application March 8, 1952, Serial No. 275,543 1 Claim. (Cl. 51-165) Thisinvention relates to a structure for setting up a grinding machine togrind a precisely predetermined taper on a piece of work revolvingbetween centers or the like. A primary object of the invention is toprovlde a quick and readily usable structure for setting up a machine togrind precisely a predetermined taper, all with the minimum number ofoperations as well as employing the minimum amount of time, and at thesame time providing an extremely high degree of accuracy in the endresult.

These and many other objects and advantages of the invention, includingthe extreme simplicity of the structure, will become apparent to thoseversed in the art in the following description of one particular form ofthe invention as illustrated in the accompanying drawing, in which Fig.1 is a top plan view of the foot stock end portion of a grinder to whichthe invention is applied; and

Fig. 2 is a fragmentary end elevation.

In the form herein shown, a slide table 10 is shown mounted to beshifted longitudinally along a V-way 11 and a flat-way 12. One end ofthe slide table 10 is provided with a raised surface 13 having parallelside, vertical edges 14 and 15. These edges 14 and 15 extendtransversely across the right hand end of the slide table 10.

Mounted on the slide table 10 is a swivel table 16 to be swiveled abouta vertical axis centrally of the slide table 10, all in a well known andusual manner. The swivel table 16 is rocked horizontally across theslide table 10 by a crank (not shown) applied to the exposed end of theshaft 17, all again in the usual and well known manner.

Mounted on the swivel table 16 is a foot stock 18 shiftablelongitudinally of that table, and carrying the center 19. The swiveltable 16 also carries a head stock (not shown) from which extends thecenter 20. Between the centers 19 and 20 is positioned the work piece21, and a grinding wheel 22 is brought up to have a face 23longitudinally traverse the work piece 21.

So much of the structure described is found in standard equipment anddoes not per se enter into the actual invention, although advantage istaken of the movements thereof.

On the tail end of the swivel table 16, there is fixed an arm 24 toextend rearwardly therefrom and to terminate over and in spaced relationabove the surface 13. The arm 24 is herein shown as having the feet 25and 26 extending at right angles therefrom to abut the swivel table 16and be secured thereto in any suitable manner, herein shown as by thescrews 27. A stem 28 is fixed to the outer portion of the arm 24 toextend downwardly therefrom toward the table 10 and to terminate in aball end 29 still spaced above the surface 13. The diameter of the ball29 is greater than the diameter of the stem 28 immediately below the arm24.

I form a slide generally designated by the numeral 30 to have an underside width equal to that of the width of the surface 13, and I provide aflange on each side of the slide 30 to extend downwardly therefrom tobear against the sides 14 and 15. These flanges are designated by thenumerals 31 and 32. A close sliding fit is provided between the flanges31 and 32 and the vertical sides 14 and 15. In this manner, the slide 30is guided and confined to travel along the surface 13.

The slide 30 is provided with a slot 33 entering from its outer end toextend into and along the slide 30 a dis 2,702,970 Patented Mar. 1, 1955tance, parallel to the flange 31. A clamp screw 34 extends through theslot 33 to screw-threadedly engage in the member 35 which has the topsurface 13. Thus, the slide 30 may be secured in any position along thesurface 13 by clamping it with the screw 34. As above indicated, themember 35 which is the member having the top surface 13 is fixed to theslide table 10 to become to all intents and purposes an integral partthereof.

The slide 30 has an upturned inner end 36, extending upwardly from thesurface 13 at right angles thereto. A central portion of this flange 36is provided with a notch 37 entering the flange 36 from its upper edgeand extending downwardly to at least the top surface of the slide 30.

On the top side of the slide 30 there is mounted an indicator gage 38 tohave its shiftable stem 39 extend through the slot 37 and normallyterminate beyond the face 40 of the flange 36.

An equalizer bar 41 is selected to extend substantially across theentire face 40 of the flange 36 and to have a thickness such that thebar 41 is not readily bendable. Such thickness for a steel bar would befor example about three-sixteenths of an inch. When the equalizer bar 41is rested on the surface 13, and brought up against the face 40 of theflange 36, it will push the indicator stem 39 toward the indicator 38 adistance equal to slightly less than the capacity of reading of theindicator.

The method of using the structure so far outlined is as follows. Thework piece 21 is placed between the centers 19 and 20, and the Work 21is ground to have a constant diameter, that is to be straight, whereinthe axis of the two centers 19 and 20 is exactly parallel with the axisof the wheel 23. This condition, of course, may be indicated withouthaving -to grind the work piece 21 straight. With the work 21 thus inthe straight setting, which is achieved by rocking the swivel table 16relative to the slide table 10, the slide plate 30 is brought up towardthe ball 29 to have the equalizer bar 41 intervene between it and theflange 36, and the plate 30 is then adjusted by sliding it along thesurface 13 to bring the indicator 38 to a zero reading with the bar 41in contact with the ball 29. At that reading the slide is fixed by thescrew 34.

Then the swivel table 16 is rocked in a horizontal direction on theslide table 10, to change the angle of the axis through the centers 19and 20to the angle of taper required. This angle is predetermined forthe desired taper. In obtaining the required setting of the swivel table16, the arm 24 will be rocked away from the equalizer bar 41, and thedistance between the ball 29 and the equalizer bar 41 will be initiallygaged by using one or more Jo (Johansen) blocks 42, herein shown as twoin number, the thickness of the two blocks as the case may bedetermining the spacing between the equalizer bar 41 and the ball 29 togive the swivel table 16 the required angle of taper. Then to get theangle precisely, the swivel table 16 is rocked back to compress theblocks 42 slightly between the ball 29 and equalizer bar 41 to bring-thebar 41 against the stem 39 so that the indicating gage 38 will bebrought to read zero. Then the swivel table 16 is in the precise anglefor the taper required.

Thus it is to be seen that I have provided not only an extremely simplemechanism, but also an extremely simple method for using that mechanismin order to obtain precisely the exact angle or taper required on thework piece. The setting is precise primarily through the major rockingdistance of the swivel table 16 by means of the Jo blocks, and finallyto the exact fractional portion of the distance by use of the indicatorgage in conjunction with the 10 blocks. All of this is used from thezero position for parallel grinding.

Therefore, while I have herein shown and described my invention in thatone precise form, it is obvious that structural variations may beemployed without departing from the spirit of the invention, and Itherefore do not desire to be limited to that precise form beyond thelimitations which may be imposed by the following claim.

I claim:

In a grinding machine, the combination with a grinding wheel rotatableabout a fixed axis; a base; a slide 3 table longitudinally traversableof the base in directions parallel to said axis; a swivel table mounted.on said slide table rockable about a vertical axis; and Work carryinghead and foot stocks mounted on said swivel table, and an arm extendingfrom the tail end of said swivel table; a ball carried by said armadjacent the upper side of said slide table; the swivel table betweenthe swivel table axis and the center of said ball constituting in effecta sine bar; a cross slide member shiftably carried by said slide tableback of said swivel table; means confining said cross slide member totravel normal to the travel of said slide table; an indicator carried infixed position on said cross slide member and having a shiftableoperating stem extending therefrom directed generally toward said ball,the axis of the stem being parallel to the directions of travel of thecross slide member; an upturned flange carried by and extendingcross-wise of the cross slide member on its end directed toward saidball, said flange having an opening through which said stem freelyextends; an equalizer bar extending freely traversely across said crossslide member and along said flange on the ball side thereof; said crossslide member being adjustably secured to said slide table in that swiveltable position of ball contact with said equalizer bar bearing againstsaid flange and said indicatorstem with the indicator having a zeroreading when the swivel table is rocked to a position having the centerline of the head and tail stocks parallel to said grinding wheel axis; agage block of thickness according to the taper angle selected insertedbetween said ball and said bar and resting on said slide table; and saidswivel table being fixed on its slide table in that position of saidball bearing against said block in turn bearing against said flange andsaid stem with said indicator having said zero reading.

References Cited in the file of this patent UNITED STATES PATENTS1,693,723 Mitchell Dec. 4, 1928 2,429,517 Knapp Oct. 21, 1947 2,600,550Levesque June 17, 1952 FOREIGN PATENTS 15,901 Great Britain Aug. 3, 1899n at' r

